<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Core\Formula\Functions;

use Espo\Core\Formula\Exceptions\Error;

use Espo\Core\Formula\{
    Functions\BaseFunction,
    ArgumentList,
};

class VariableType extends BaseFunction
{
    public function process(ArgumentList $args)
    {
        if (!count($args)) {
            throw Error("No variable name.");
        }

        $name = $args[0]->getData();

        if (!is_string($name)) {
            throw new Error("Bad variable name.");
        }

        if (is_null($name) && $name === '') {
            throw new Error("Empty variable name.");
        }

        if (!property_exists($this->getVariables(), $name)) {
            return null;
        }

        return $this->getVariables()->$name;
    }
}
